<template>
  <view>
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滑动区 -->
      <scroll-view scroll-y="true" :style="{height: wh+'px'}" class="left-scroll-view">
        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-sroll-view-item', i === active?'active':'']" @click="activeChanged(i)">{{item.cat_name}}
          </view>
        </block>

      </scroll-view>
      <!-- 右侧的滑动区 -->
      <scroll-view scroll-y="true" :style="{height: wh+'px'}" class="right-scroll-view" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title">
            /{{item2.cat_name}}/
          </view>
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <image :src="item3.cat_icon" mode=""></image>
              <text>{{item3.cat_name}}</text>
            </view>

          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import {
    getCateList
  } from '@/utils/api.js'
  import
  badgeMix
  from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [badgeMix],
    data() {
      return {
        wh: 0,
        cateList: [],
        active: 0,
        cateLevel2: [],
        scrollTop: 0
      };
    },
    onLoad() {
      const systemInfo = uni.getSystemInfoSync()
      this.wh = systemInfo.windowHeight - 50
      this.getCateListEx()
    },
    methods: {
      async getCateListEx() {
        const {
          data: res
        } = await getCateList()
        if (res.meta.status !== 200) {
          this.$showMsg()
          return
        }
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(e) {
        this.active = e
        this.cateLevel2 = this.cateList[e].children
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      gotoGoodsList(e) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + e.cat_id
        })
      },
      gotoSearch() {
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;
    }
  }

  .left-sroll-view-item {
    background-color: #f7f7f7;
    line-height: 60px;
    text-align: center;
    font-size: 12px;

    &.active {
      background-color: #ffffff;
      position: relative;

      &::before {
        content: ' ';
        display: block;
        width: 3px;
        height: 30px;
        background-color: #c00000;
        position: absolute;
        top: 50%;
        left: 0;
        transform: translateY(-50%);
      }
    }
  }

  .cate-lv2-title {
    text-align: center;
    font-size: 12px;
    font-weight: bold;
    padding: 15px 0;
  }

  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;

    .cate-lv3-item {
      width: 33.33%;
      display: flex;
      flex-direction: column;
      align-items: center;
      margin-bottom: 10px;
      justify-content: center;

      image {
        width: 60px;
        height: 60px;
      }

      text {
        font-size: 12px;
      }
    }
  }
</style>